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Letters Patent No. 174,539, dated .February 18,1868'.

' IMPROVEMENT IN "sonst-suore;

, titetlgzhnle nfimt In imtlgtst ritert tutti mth mating part nf tlg:sans.

ro ALL. wHoM 1r MAY ooNoERm' Be it knownrthat I, N. WJHUBARD, of thecity, county, and State of New York, have inventedfa new and usefulImprovement in Horse-Shoes; and I do hereby declare thatthe following isa full, clear, andiexact description thereof, whichw'ill enable` othersskilled in the art to-make'and use the same,reference being had to theaccompanyin'gdrawings, forming part ofthis specification, in which IFigure 1 is a plan view 'of my'improved horse-shoe.

Figure 2 is a sectional view of the same, throughthe line :r w, iig. 1.

Figure 3 is a. plan viewiot' a modification of the same,

Figures 4 and 5'are corresponding views of the wrench.

Similar letters of reference indicate corresponding parts.

The object of this invention is 4to'provide a horse-shoe with removablecalks, whereby the sane mayube renewed from time to time, as the calksbecome worn, without removing thevshoe from the horses foot. V1tconsists, in general terms, of removable plates, serving as'matricesfo'rthe cnlks, and which are held to -the shoe by screws employed in contactwith certain ilanges or upset edges of the plates, together with otherdevices, perfecting the whole, as will hereinafter be more fully setlforth. i i

In the accompanying plateof drawings, theshoe proper isV shownat A. Theheel-callr's are ainxed to the shoe by means of heel-plates B and C. iThese plates have upset' or vertical sides, which are dove-tailed intothe shoe, as shown at B, or' are simply let in ilush Iin the outer andinner sides ofthe shoe, as shown at C. When dove-tailed in, a shortset-screw, b, sutces to hold, but when merely let in,a screw, passingthrough from side.

to side, as shown at d, is preferable. The calks are set into theseheel-plates in the same manner as the calks ofthe toe-plate,whichwill'be hereinafter described. Thetoe-plate Gis turned up in front,as shown ntf, and bevelled t-o iit a corresponding bevel on the shoe, asshown at z', which serves, in: connection with the clampscrew a, to holdthe plate Gtightly in place. The angefis recessed, so as to conform tothe base of the tip L, which latter rests against thev outside o f thchoot. The clamp-screw a works in a rear projection oizthe plate Gr, thesaidprojection rising from the said ,plate to a position behind the toepartof the shoe, so that screw a shall be'ar against the upper surfaceofthe said toc-part, in the manner shown. A recess is made in the shoeat this period to receive the end of the4 clamp-screw a, and therebypresent a surface for vthe said end to abut against, so that when thesaid screw is turned in, the bevelled p arts t' will be drawn in closecontact, and the plate Gbe actuated to a strong', close contact with"the shoe. The clamp-screw a also projects over the shoe, which holds theplate from being withdrawn downward.V The calks E are pyramidal piecesof steel or case hardened iron, and fit into the plates Gr, B, and C,substantially as shown, and, as the base ofl the calks is in firmcontact with the bottom surface of the horseshoe, and the sides oi' theholes conform to the taper of thi sides of the calli, the latter is heldmmovably in place, and will not become loose by the most severe usage towhich a. shoe is-subjected.

When, in the c'ourseof continued use, the parts of the ealks becomedulled, Vthe, plate G is removed, and new calks set in. These can bemanufactured by the quantity at a tritling lexpense per dozen.4 As theholes or .matrices into 'which they t are made of the exa-ct form andsizeof the calks, any .of the latter vcan be-taken indiscriminately andinserted.l

A'modification of the mode of attaching the plate is shown at iig. 3,where the clamp-screw is within.

the part D,`as'rst described, but the taperprojection j from 'thehorselshooserves, with the recess in the Hang-esj"Y and .claniprsc cw,to hold the plate G rmly. 4

When the plate is to be removed, the clamp-screw is loosencdjustsufficiently to allow the point of the plate Gr to drop, and therebypermit the passage of the said recess by the tip 7L. The plate G is thonturned Vlaterally until'clear oi the tip L and firojection'when theplate can be withdrawn.

The plate is again putjon by A.following the reverse of the :theredescription for taking oil.

The wrench, shown at figs. 4 and, is employed to remove theplates with.By this last modification, a smaller clamp-screw can be used thanthat-necessary in the first-described shoe. v

This inveutionsupplies a. long-felt want, and has been pioved bypracicaltriel to be durable and perfectly effective in preventing'horses from. slipping on i'ce or frosted pavements.

Having described my inventin, I claim as new, and desire to secure byLetters Patent-.-

1. The-removable toe-ealks E for` horse-shoes,substantially,as s hpwn.and described, eombiimtion with the toe-plate Gr, clamp-screw a, or itsequivalent, all :Ls-endl for the p'urpese set forth.

2.4 The heel-calks for liorseslioes, substantially as shownfinddesribed, in'cornbimition "Wi'th lthe plates, as shwnfat B er C, andscrews b or cl, all as and for the purpose sei;y forth.' The abvespeeication ofmy inyention signed by me, this Q'th dey ofil'anuary,1868. Y v N. W. HUBBARD.

Witnesses:

WM. F. McNAMARA, CEAS. A. PETTIT.

